检索结果-南通市图书馆

人民长江 2001年第Z1期32卷 53-56页

作者： Xu Quan-xi Engineer, hydrology Bureau,changjiang water resources commission, wuhan 430010,china Engineer Hydrology BureauChangjiang Water Resources Commission

Based on the basic principles of BP artificial neural network model and the fundamental law of water and sediment yield in a river basin, a BP neural network model is developed by using observed data, with rainfall conditions serving as affecting factors. The model has satisfactory performance of learning and generalization and can be also used to assess the influence of human activities on water and sediment yield in a river basin. The model is applied to compute the runoff and sediment transmission at Xingshan, Bixi and Shunlixia stations. Comparison between the results from the model and the observed data shows that the model is basically reasonable and reliable.

关键词： water and sediment yield in a river-basin observed data water and sediment variation BP neural network model

Excavation of Inlet Tunnels at Geheyan Power Station

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人民长江 2001年第Z1期32卷 21-22页

作者： LIU Li xinEngineer, Design Institute, changjiang water resources commission, wuhan 430010,china CHANG Han junEngineer, Design Institute, changjiang water resources commission, wuhan 430010,china Engineer Design Institute Changjiang Water Resources Commission

The Geheyan Power Station on the Qingjiang river has four inlet tunnels, on the right bank, with its excavation diameter of 11.3 m to 12.5 m, after lining diameter of 9.5 m, axis to axis spacing of 24 m. The thickness of the pillar between tunnels should usually be more than two times of tunnel diameter to ensure the stability of surrounding rock during excavation. In this paper, the excavation methods of tunnels with the pillar thickness as small as the tunnel diameter, such as smooth surface blasting, shotcrete support protection, are emphatically discussed.

关键词： power tunnel adjacent tunnel excavation New Austrian tunnelling method Geheyan Power Station

Cracks in Tianshengqiao CFRD Versus Sectionalized Filling

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人民长江 2001年第Z1期32卷 18-20页

作者： CHEN Sheng pingSenior Engineer, Design Institute, changjiang water resources commission, wuhan 430010,china XU Kui dongEngineer, Design Institute, changjiang water resources commission, wuhan 430010,china Senior Engineer Design Institute Changjiang Water Resources Commission Engineer Design Institute Changjiang Water Resources Commission

During the later period of construction of Tianshengqiao concrete faced rockfill dam(CFRD), cracks appeared in the upstream fill slope. The main reason was the nonuniform deformation. The treatment methods were: for cracks with opening less than 1 cm, the cracked slope was compacted with added effort to eliminate cracks; for cracks with opening greater than 1 cm , crack grouting was carried out . The practice demonstrated the treatment was successful. Careful analysis of the relation between sectionalized filling and crack emergence is of significance in guiding the construction design and drawing out filling plan for a high CFRD.

关键词： CFRD sectionalized fill cracks in fill slope contributing factors crack treatment

Preliminary Study in Spatial Data Warehouse of Flood Control and Disaster Mitigation in Yangtze river Basin

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人民长江 2002年第Z1期33卷 90-92页

作者： ZHAN Xiao guoSenior engineer, Yangtze river Scientific Research Institute, changjiang water resources commission, wuhan 430010, china Senior engineer Yangtze River Scientific Research Institute Changjiang Water Resources Commission Wuhan 430010 China

Since 1990s,the spatial data warehouse technology has rapidly been developing, but due to the complexity of multi-dimensional analysis, extensive application of the spatial data warehouse technology is affected. In the light of the characteristics of the flood control and disaster mitigation in the Yangtze river basin, it is proposed to design a scheme about the subjects and data distribution of the spatial data warehouse of the flood control and disaster mitigation in Yangtze river basin, i.e., to adopt a distributed scheme. The creation and development of the spatial data warehouse of the flood control and disaster mitigation in Yangtze river basin is presented .The necessity and urgency of establishing the spatial data warehouse is expounded from the viewpoint of the present situation being short of available information for the flood control and disaster mitigation in Yangtze river basin.

关键词： spatial data warehouse distributional scheme flood control and disaster mitigation Yangtze river

Design & Construction Progress and Prospect of TGP

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人民长江 2002年第Z1期33卷 2-6页

作者： ZHENG Shou-renChief Engineer, changjiang water resources commission, wuhan 430010, china Chief Engineer Changjiang Water Resources Commission Wuhan 430010 China

The construction of the TGP has proceeded smoothly since its commencement of construction in 1994 and the construction quality is good in general. The construction proceeds in accordance with the master project schedule in preliminary design approved by the central government and the investment can be controlled within the total budget of the preliminary design. The changjiang water resources commission, taking charge of the general design jobs of the TGP, has consistently paid attention to the project quality in the first place and carried out large amount of investigation, design and scientific research work. This paper makes an overall summarization and presentation on important technical issues in the design, such as dam, powerhouse structure, permanent ship locks, ship lift, project safety monitoring, main river closure and the 2nd stage cofferdam, mechanical and electric design etc., and put forwards a lot of suggestions about optimizing design schemes and measures for smoothing away construction difficulties in accordance with construction progress.

关键词： hydraulic structure electromechanical equipment technical design construction progress safety monitoring Three Gorges Multipurpose Project

Test and Analysis on Soil Characteristics for the South Main Dyke of Jingjiang river

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人民长江 2002年第Z1期33卷 69-73页

作者： ZHOU Xiao-wenSenior Engineer, changjiang Scientific Institute of changjiang water resources commission, wuhan 430010, china HE Xiao-minEngineer, changjiang Scientific Institute of changjiang water resources commission, wuhan 430010, china GONG Bi-weiSenior Engineer, changjiang Scientific Institute of changjiang water resources commission, wuhan 430010, china Senior Engineer Changjiang Scientific Institute of Changjiang Water Resources Commission Wuhan 430010 China Engineer Changjiang Scientific Institute of Changjiang Water Resources Commission Wuhan 430010 China

In coordination of the construction of concealed work of levee project, the research on the soil quality of Jingnan levee in Hubei province was carried out through test. The results demonstrate: ① the Jingnan levee embankment is in bad quality, the compaction degree of most levee sections doesn’t reach 92%; the average compressive coefficient of the levee backfilled soils is about 0.3 MPa; the seepage coefficients are 10\+ -5 ～10\+ -6 cm/s generally; the levee body was compacted unevenly; ② the soil layers of the levee foundation are distributed complicatedly and generally in low density; the void ratios of various soils are mostly in 0.7～1, indicating that the foundation soils are generally in loose state; ③ the pH value of levee body and foundation is 7.05～8.95, attributing to weak alkaline and not producing significant influence on liquid-plastic limit and shear strength of soils, the content of strongly soluble salt of levee foundation soils is 0.01%～0.52% and will not produce great influence on the mechanical behaviours of soils.

关键词： soil test regional engineering geology levee foundation soil feasibility study the Yangtze levee

CHARACTERIZATION AND CAUSATION OF RUNOFF AND SEDIMENT VARIATION IN THE JIALINGJIANG river BASIN

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International Journal of Sediment Research 2007年第3期22卷 228-237页

作者： quanxi XU1,2, Songsheng CHEN3, Ming XIONG4, Shengwei LI5, and Zefang CHEN6 1 Senior engineer, Bureau of hydrology, changjiang water resources commission(CWRC), wuhan 430010, china2 State Key Laboratory of water resources and Hydropower Engineering Science, wuhan University, wuhan, china, 430072. 3,4 Prof., Bureau of hydrology, CWRC, wuhan, china 430010. 5,6 Engineer, Bureau of hydrology, CWRC, wuhan, china 430010. CWRC Bur Hydrol Wuhan 430010 Peoples R China wuhan Univ State Key Lab Water Resources & Hydropower Engn S Wuhan 430072 Peoples R China

The Jialingjiang river basin is one of the main sediment contributing areas in the upper reaches of the changjiang river. Great changes have taken place in the runoff and sediment discharge in recent years. Comparing the data of 1991-2003 with the data of 1954-1990, the annual runoff of the Jialingjiang river basin decreased by 23 %, and the suspended sediment transport decreased by 74% or 105 million tons. The main factors affecting the reduction include a decrease in rainfall, sediment detention of hydraulic structures, soil and water conservation activities, sedimentation and sand dredging in the river channel. Thorough investigation and analysis of the contribution of each factor to the sediment decrease at Beibei Station was determined for the first time. The following are the contributing percentages for each factor: a decrease in runoff accounted for 32.9%; soil and water conservation measures accounted for 16.4%; sediment detention of hydraulic structures accounted for 30.5%; sedimentation, river channel sand dredging, and other factors accounted for 20.2%. These findings are very important for forecasting the trend of inflow sediment discharge variation.

关键词： Jialingjiang river basin Variation in characteristic of runoff and sediment Quantitative analysis on contribution of influence factors

Engineering Geological Problems of Levee Along Middle and Lower Reaches of Yangtze river

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人民长江 2002年第Z1期33卷 74-77页

作者： MA Gui-shengSenior Engineer, Comprehensive Reconnaissance Bureau, changjiang water resources commission, wuhan 430010, china Senior Engineer Comprehensive Reconnaissance Bureau Changjiang Water Resources Commission Wuhan 430010 China

The levee along middle and lower reaches of Yangtze, about 3 600 km long, was built mostly on loose quaternary deposit with changeful complicated formation and geologic defects. Hence, during flood season, dangerous events occur frequently, which imperil the levee’s safety and pose great threats to life and property of people behind the levee. According to the exploration and investigation results, a classification of subsoil profile is made. And then the analysis on main engineering geologic problems, i.e seepage failure of dyke and bank slope instability, is conducted. The internal relations between main engineering geologic problems and subsoil profile are found out, which provides a scientific basis for the design of strengthening dykes.

关键词： subsoil profile seepage failure bank slope instability

Geologic Survey and Stability Analysis for the South Tower Pier of Jiangyin Yangtze Highway Bridge

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人民长江 2002年第Z1期33卷 87-89页

作者： XU Fu-xingProfessor-senior Engineer, Comprehensive Reconnaissance Bureau of changjiang water resources commission, wuhan 430010, china ZHAO Cheng-shengSenior Engineer, Comprehensive Reconnaissance Bureau of changjiang water resources commission, wuhan 430010, china YANG Tian-mingSenior Engineer, Comprehensive Reconnaissance Bureau of changjiang water resources commission, wuhan 430010, china Professor-senior Engineer Comprehensive Reconnaissance Bureau of Changjiang Water Resources Commission Wuhan 430010 China Senior Engineer Comprehensive Reconnaissance Bureau of Changjiang Water Resources Commission Wuhan 430010 China

Jiangyin Yangtze highway bridge is a suspension bridge with main span 1 385 m. The south tower pier is located on a 70 m bedrock slope with bedding plane of strata tipping to the river channel and several weak intercalated layers. The stability of the tower pier is one of the main engineering geologic problems. On the basis of investigation and survey of relevant geologic condition analyses, the geomechanical model experiments are carried out for stability study of various foundation alternatives’ advantages and disadvantages. Pile foundation has been finally adopted and constructed, and this is justified by practice.

关键词： stability of tower pier pile foundation geomechanical model Jiangyin Yangtze highway bridge